Pyrimidine-based crosslinking agents

Abstract

Pyrimidine-based crosslinking agents for thermally curable compositions, especially thermally curing coating materials, adhesive, sealing compounds or compounds for producing moldings.

What is claimed is:  
     
       1. A pyrimidine-based crosslinking agent for thermally curable compositions, comprising one or more pyrimidines of the general formula I;                    
       wherein: 
       n=0 or 1  
       R 1  and R 2 =identical or different radicals of the general formula II:  
       
         
           —NH—(CX)—YR 4   (II),  
         
       
       wherein X is selected from the group consisting of ═O, and ═S; Y is selected from the group consisting of —O—, —S—, and —NH—; and R is selected from the group consisting of monovalent substituted or substituted C1 to C20 alkyl, C2 to C20 alkenyl, C4 to C12 cycloalkyl or cycloalkenyl, C6 to C12 aryl or C6 to C20 arylalkyl, arylalkenyl, arylcycloalkyl, arylcycloalkehyl, alkylaryl, alkenylaryl, cycloalkylaryl, cycloalkenylaryl, alkylcycloalkyl, alkylcycloalkenyl, alkenylcycloalkyl, alkenylcycloalkenyl, cycloalkylalkyl, cycloalkenylalkyl, cycloalkylalkenyl and cycloalkenylalkenyl radicals; 
       R 5  is selected from the group consisting of —F, —Cl, —Br, —I, —CN, —NO 2 , substituted or unsubstituted radical R 4 , substituted or unsubstituted radical —YR 4 ; and  
       R 3  is selected from the group consisting of radical R 1 , radical R 2 , a radical of the general formulae III and a radical of the general formulae IV;                    
       in which the variables R 1 , R 2 , and R 5  are as defined above, and the indices m and o and the variable R 6  have the following definition: 
       R 6 =alkane-, alkene-, cyclolkane- or cycloalkenediyl or -triyl radical or divalent or trivalent aromatic, aromatic-aliphatic, aromatic-cycloaliphatic, aromatic-olefinic or aromatic-cycloolefinic radical;  
       m=0, 1 or 2,  
       o=0 or 1;  
       with the proviso that if R 3 =a radical of the general formula IV, the radical R 1  or R 2  of the general formula I may also be a hydrogen atom.  
     
     
       2. The crosslinking agent of  claim 1 , comprising at least one of the tris(alkoxycarbonylamino)pyrimidines of the general formulae (I-1) to (I-6):                    
     
     
       3. The crosslinking agent of  claim 2 , comprising 2,4,6-, 2,4,5 and/or 2,3,4-tris(alkoxycarbonylamino)pyrimidine. 
     
     
       4. The crosslinking agent of  claim 3 , comprising 2,4,6-tris(alkoxycarbonylamino)pyrimidine. 
     
     
       5. A process for preparing a thermally curable composition comprising mixing two or more constituents, wherein at least one constituent comprises the pyrimidine-based crosslinking agent of  claim 1 . 
     
     
       6. A thermally curable composition comprising at least one crosslinking agent as claimed in  claim 1 . 
     
     
       7. The thermally curable composition of  claim 6  selected from the group consisting of a coating material, an adhesive, a sealing compound and a compound for producing moldings. 
     
     
       8. Single-coat or multicoat transparent, clear or matt, color and/or effect or electrically conductive coatings comprising a coating material as claimed in  claim 7 . 
     
     
       9. Single or multiple adhesive films comprising an adhesive as claimed in  claim 7 . 
     
     
       10. Seals comprising a sealing compound as claimed in  claim 7 . 
     
     
       11. Moldings comprising a compound for producing moldings as claimed in  claim 7 . 
     
     
       12. Primed or unprimed substrates comprising at least one coating as claimed in  claim 8 . 
     
     
       13. The primed or unprimed substrates of  claim 12 , further comprising one or more materials selected from the group consisting of metals, plastics, wood, ceramic, stone, textile, fiber composites, leather, glass, glass fibers, glass wool and rockwool, mineral- and resin-bound building materials, such as plasterboard and cement slabs or roof tiles, metals, plastics, wood, ceramic, stone, textile, fiber compositions, leather, glass, glass fibers, glass wool and rockwool, mineral- and resin-bound building materials, such as plasterboard and cement slabs or roof tiles, and composites of these materials. 
     
     
       14. The primed or unprimed substrates of  claim 12 , which are automobile body parts or industrial components. 
     
     
       15. The primed or unprimed substrates of  claim 12  further comprising at least one molding as claimed in  claim 11 .